On Valentine's Day, popular mystery author Aigasa Kurisu invites Kiyotaka and Aoi to the Shinkokan at the Yoshida-Sanso. But instead of an innocent book reading, they find a group of suspects and a mystery to be solved.
either Suzuka-san or Kumi-san, 
who were present at the time.
إمّا سوزوكا-سان أو كومي-سان
.اللّتان كانتا حاضرتين حينها
Suzuka ou Kumi,
qui étaient sur place.
dev'essere Suzuka-san o Kumi-san.
foi quem estava presente na hora.
либо Судзука, либо Куми, 
так как они были там.